Danbooru
Safe(No Adult)
Posts
Comments
Notes
Artists
Tags
Pools
Wiki
Forum
More »
Listing
Search
Help
|
Posts (93)
History
.
close
abacus
Ancient manual calculation device still used in East Asia today. Japanese term is
soroban
(そろばん).
For more info:
Wikipedia, Abacus article
Wikipedia, separate article for the Japanese abacus
Recent Posts
»